WellCAD Basics - Advanced Logic Technology

APPENDIX A - 235
Scale:
The horizontal scale of the Well Log column can be changed by editing the numbers
in the min and max edit boxes. The values displayed next to the edit boxes show
the total minimum and maximum value of the data set.
The scale values chosen will be displayed in the Properties area of the log handle if
the size of the area is large enough.
Linear / Logarithmic:
To change the horizontal scale of the Well Log column from linear to logarithmic,
click on the corresponding radio button. The vertical grid frequency of a Well Log in
logarithmic mode is controlled by the decades option. To graphically represent the
data correctly and to avoid log wrap the order of the magnitude between minimum
and maximum scale value has to be taken into account. A log with a minimum of 8
and a maximum of 250 covers two decades (3 – 30 and 30 – 300). WellCAD sets the
scale limits as follows: The maximum scale value that has been entered is rounded
up to a multiple of the highest power of ten (e.g. 250 will be rounded up to 300).
Then the number of decades is used to calculate the minimum value (e.g. if the max.
is 300 and decades is 2 the min. will be 3). The values will be set automatically
without replacing the entries of max and min scale.
Overwrite depth grids:
If this option is checked the grid lines belonging to the log will be covert by the
curve and the opaque shading if one has been chosen.
Reverse:
Grid lines on top (left) and grid lines overwritten by the curve (right)
Normally the curve is drawn with increasing values from left to right. If the
Reversed option has been selected the curve is drawn with the values increasing